[Bug regex/11053] Wrong results with backreferences

["eggert at cs dot ucla.edu" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=11053

eggert at cs dot ucla.edu changed:

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                 CC|                            |eggert at cs dot ucla.edu

--- Comment #6 from eggert at cs dot ucla.edu ---
Created attachment 10674
  --> https://sourceware.org/bugzilla/attachment.cgi?id=10674&action=edit
This test case silently returns the wrong answer

Following up on a 'grep' bug report here:

https://debbugs.gnu.org/29613

attached is a seemingly-related test case which illustrates a bug that causes
'grep' to quietly return the wrong answer instead of dumping core. This test
case should exit successfully, but because of the bug regexec returns 0 so the
test case exits with status 1. I compiled and ran it on Fedora 27 x86-64 with
"gcc regbug.c; ./a.out".

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